I'm just getting into analog electronics. Nominally, I'm trying to synthesize 90VAC @ 30mA (telephone ring signal) using buck/boost from a "reasonable" input voltage with reasonable efficiency. Not anywhere close to worrying about interference, but seeing simulated 3A swings at 1MHz is not encouraging... A big chunk of that is due to gate/src & src/drain capacitance. I'm finding that jacking up the inductance leads to really high average currents, cutting the inductance means really small damping resistors and high current again, shrinking the output capacitance helps the ringing and quickly gets the voltage where I need it, but now the ripple is horrible... fun times!